WO2023015952A1 - 显示面板及显示装置 - Google Patents

显示面板及显示装置 Download PDF

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Publication number
WO2023015952A1
WO2023015952A1 PCT/CN2022/089346 CN2022089346W WO2023015952A1 WO 2023015952 A1 WO2023015952 A1 WO 2023015952A1 CN 2022089346 W CN2022089346 W CN 2022089346W WO 2023015952 A1 WO2023015952 A1 WO 2023015952A1
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WIPO (PCT)
Prior art keywords
layer
display panel
light
hole
substrate
Prior art date
Application number
PCT/CN2022/089346
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English (en)
French (fr)
Inventor
任庆荣
邢汝博
李俊峰
王刚
郭瑞
崔霜
张豪峰
胡世文
Original Assignee
云谷（固安）科技有限公司
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Application filed by 云谷（固安）科技有限公司 filed Critical 云谷（固安）科技有限公司
Priority to KR1020237026167A priority Critical patent/KR20230121159A/ko
Priority to JP2023545888A priority patent/JP2024504459A/ja
Publication of WO2023015952A1 publication Critical patent/WO2023015952A1/zh
Priority to US18/362,250 priority patent/US20230380226A1/en

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/126—Shielding, e.g. light-blocking means over the TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present application relates to the field of display technology, in particular to a display panel and a display device.
  • the optical fingerprint recognition technology under the screen is increasingly used in display devices such as mobile phones and tablet computers.
  • the under-screen optical fingerprint recognition technology is to install an optical fingerprint sensor on the back of the display panel of the display device, and the light reflected by the finger above the display panel passes through the display panel and is received by the optical fingerprint sensor for fingerprint recognition.
  • embodiments of the present application provide a display panel and a display device, which can ensure the production quality of the display panel.
  • the first aspect of the embodiments of the present application provides a display panel, the display panel includes an optical fingerprint area, the optical fingerprint area is provided with a light-blocking layer and a protective layer, and the light-blocking layer is provided with a plurality of through holes;
  • the protective layer includes a filling part, the filling part fills at least a part of the area in the through hole; the filling part fills a part of the area in the through hole, and the filling part surrounds the side wall of the through hole and tightly
  • the protective layer also includes a light-transmitting part, the filling part is located between the light-transmitting part and the side wall of the through hole, and the height of the light-transmitting part is greater than or equal to the The depth of the through hole, the angle formed by the bottom wall of the filling part and the side wall of the light-transmitting part is an acute angle; or, the filling part fills the entire area in the through hole, and the material of the filling part is Light-transmitting material.
  • the display panel provided by the embodiment of the present application has an optical fingerprint area, and a light blocking layer and a protective layer are arranged in the optical fingerprint area.
  • the hole passes through the display panel and enters the optical fingerprint sensor to realize fingerprint recognition.
  • the protection layer can fill the through holes without affecting the light transmittance of the through holes, so as to ensure the integrity of each functional layer arranged on the light blocking layer and improve the product quality of the display panel.
  • a second aspect of the embodiments of the present application provides a display device, which includes the above-mentioned display panel and an optical fingerprint sensor disposed on the back of the display panel, where the optical fingerprint sensor corresponds to the optical fingerprint area.
  • the display device includes the display panel of the first aspect above, the display device also has the same advantages as the display panel, for details, reference may be made to the above description.
  • FIG. 1 is a cross-sectional view of a display device provided by an embodiment of the present application
  • FIG. 2 is a cross-sectional view of a display panel provided by an embodiment of the present application.
  • FIG. 3 is an imaging principle diagram of the display panel shown in FIG. 2;
  • FIG. 4 is a cross-sectional view of a display panel provided by another embodiment of the present application.
  • FIG. 5 is a cross-sectional view of a display panel provided by another embodiment of the present application.
  • FIG. 6 is a cross-sectional view of a display panel provided by another embodiment of the present application.
  • FIG. 7 is a cross-sectional view of a display panel provided by another embodiment of the present application.
  • FIG. 8 is a cross-sectional view of a display panel provided by yet another embodiment of the present application.
  • FIG. 9 is a cross-sectional view of a display panel provided by another embodiment of the present application.
  • FIG. 10 is a cross-sectional view of a display panel provided by still another embodiment of the present application.
  • a light-blocking layer is added to the array substrate of the display panel, and a small hole is set in the area of the light-blocking layer corresponding to the optical fingerprint sensor.
  • the pinhole imaging principle guides more light reflected from the finger above the display panel to the optical fingerprint sensor.
  • the embodiment of the present application provides a display panel, in which a through hole for small hole imaging is formed on the light blocking layer, and at the same time, the protective layer is used to fill the through hole without affecting the light transmittance of the through hole , so as to ensure the integrity of each functional layer arranged on the light-shielding layer and improve the product quality of the display panel.
  • the display device provided by the embodiment of the present application includes a display panel 100 and an optical fingerprint sensor 200 disposed on the back of the display panel 100 .
  • the display panel 100 is generally used for displaying information such as images and realizing touch functions, and the display panel 100 may be, for example, an OLED (Organic Light-Emitting Diode) display panel;
  • the optical fingerprint sensor 200 is used for receiving light reflected or refracted by a finger , to achieve fingerprint recognition.
  • the display panel 100 includes an array substrate 10 , a plurality of pixel units 20 disposed on the array substrate 10 , a pixel defining layer 30 for isolating the pixel units 20 , and an encapsulation layer 50 covering the pixel units 20 .
  • fingerprint recognition the light emitted by the pixel unit 20 in the display panel 100 irradiates the finger placed on the display panel 100, and the light reflected or refracted by the finger passes through the display panel 100 and is received by the optical fingerprint sensor 200. , for fingerprinting.
  • the array substrate 10 includes a substrate 101 and an active layer 11 , a first insulating layer 12 , a first metal layer 13 , a second insulating layer 14 , a second metal layer 15 ,
  • the three metal layers 17 include source and drain electrodes of the thin film transistor, the source and drain electrodes are connected to the pixel unit 20 through the first wire 191 , and the source and drain electrodes are connected to the active layer 11 through the second wire 192 .
  • the active layer 11 may be made of amorphous silicon (a ⁇ Si), polycrystalline silicon (poly ⁇ Si), organic semiconductor, or the like.
  • the first insulating layer 12 , the second insulating layer 14 and the third insulating layer 16 may be inorganic material layers made of silicon oxide, silicon nitride and other materials.
  • the planarization layer 18 may be an organic material layer made of resin or the like.
  • the first metal layer 13 , the second metal layer 15 and the third metal layer 17 may be metal film layers made of metals such as molybdenum and titanium.
  • a pixel defining layer 30 is disposed on the planarization layer 18 of the array substrate 10 , and the pixel defining layer 30 is disposed with a plurality of pixel openings, and each pixel unit 20 is respectively located in each pixel opening.
  • the display panel 100 has an optical fingerprint area, and the optical fingerprint area is provided with a light-blocking layer 71.
  • the light-blocking layer 71 is provided with a plurality of through holes 711, and the plurality of through holes 711 are used for pinhole imaging.
  • a finger is placed on the display panel 100, and the light reflected or refracted by the finger passes through the through hole 711, and then passes through the display panel 100 and falls into the optical fingerprint sensor 200. Since the light is along a straight line Propagated, according to the principle of pinhole imaging, the image of the finger passes through the through hole 711 to form an inverted image on the optical fingerprint sensor 200 .
  • the size of the through hole 711 is not limited, and it can be set according to the optical principle of pinhole imaging to realize pinhole imaging, thereby guiding more light reflected from the finger to the optical fingerprint sensor 200 .
  • the shape of the through hole 711 is a circular hole, and the diameter of the circular hole is 5-20 microns to ensure that it is formed on the optical fingerprint sensor 200.
  • the clarity of the virtual image improves the recognition effect of the optical fingerprint sensor 200 .
  • the shape of the through hole 711 is not limited to the above-mentioned circular hole, and may also be other shapes such as an elliptical hole, a square hole, and the like.
  • the optical fingerprint area also includes a protective layer 72 , which is used to fill the through hole 711 without affecting the light transmittance of the through hole 711 , so as to ensure the integrity of the functional layers on the light blocking layer 71 .
  • the protection layer 72 includes a filling portion 721 that fills at least a partial area in the through hole 711. In some embodiments, as shown in FIG. area, so as to ensure the integrity of each functional layer on the light-shielding layer 71 , for example, the disconnection of the cathode can be effectively avoided, so as to ensure the product quality of the display panel 100 .
  • the filling portion 721 may also fill a partial area in the through hole 711 .
  • the filling portion 721 surrounds the sidewall of the through hole 711 and is arranged close to the sidewall
  • the protective layer 72 also includes a light-transmitting portion 723
  • the filling portion 721 is located between the light-transmitting portion 723 and the through hole.
  • the height of the transparent part 723 is greater than or equal to the depth of the through hole 711
  • the angle formed by the bottom wall of the filling part 721 and the sidewall of the transparent part 723 is an acute angle.
  • the translucent portion 723 is used to ensure the translucency of the through hole 711, and the filling portion 721 is provided between the translucent portion 723 and the side wall of the through hole 711, and the bottom wall of the filling portion 721 is connected to the side wall of the translucent portion 723.
  • the included angle formed by the sidewall is an acute angle, so that no filling dead space will be formed inside the bottom of the filling portion 721, ensuring that when the functional layer on the light-shielding layer 71 is formed, the functional layer can be formed on the inner side wall of the filling portion 721 and the inner side of the filling portion 721.
  • the area where the bottom wall joins remains continuous, so as to ensure the integrity of each functional layer formed on the light-shielding layer 71 , for example, to effectively avoid cathode disconnection, thereby ensuring the product quality of the display panel 100 .
  • the material of the light-shielding layer 71 can be any material with a light-shielding effect, for example, it can be a black resin material layer or the like.
  • the light-shielding layer 71 is a black matrix material layer, and the material of the black matrix material layer can be a negative photoresist containing chromium or carbon black.
  • the light-shielding layer 71 made of a black matrix material layer can improve the light-shielding effect of the light-shielding layer 71 , thereby improving the signal-to-noise ratio of the optical signal entering the optical fingerprint sensor 200 and ensuring the yield rate of the display panel 100 .
  • the light-blocking layer 71 is a black matrix material layer
  • a photolithography process is used to form a through hole 711 on the light-blocking layer 71.
  • the shape of the formed through hole 711 is: the cross-sectional shape in the plane perpendicular to the pixel defining layer 30 is a positive trapezoid, that is, a shape with a narrow top and a wide bottom.
  • the through holes 711 that are narrow at the top and wide at the bottom will affect the integrity of the functional layers of the integral structure formed on the light blocking layer 71 .
  • each pixel unit 20 includes a first electrode 21 , a light emitting material layer 22 and a second electrode 23 .
  • each second electrode 23 is located on the pixel defining layer 30 , and each second electrode 23 has an integral structure, that is, each second electrode 23 forms a whole second electrode layer.
  • the first electrode 21 is an anode
  • the second electrode 23 is a cathode.
  • the pixel unit 20 further includes a hole injection layer 24 , a hole transport layer 25 , an electron transport layer 26 and an electron injection layer 27 .
  • the hole injection layer 24 is located on the first electrode 21 as the anode, and the hole transport layer 25 is located on the side of the hole injection layer 24 away from the first electrode 21.
  • the function of the hole injection layer 24 is to improve the Energy level matching between the anode layer and the hole transport layer 25 .
  • the preparation material of the anode layer is an indium tin oxide layer (Indium Tin Oxides, ITO), and the energy level of the material of the commonly used hole transport layer 25 does not match the energy level of the ITO layer, resulting in a relatively low hole transport efficiency.
  • ITO Indium Tin Oxides
  • the injection barrier between the anode layer and the hole transport layer 25 can be reduced, and holes can be injected from the ITO layer into the hole transport layer 25.
  • the electron injection layer 27 can improve the energy level matching between the cathode layer and the electron transport layer 26 .
  • the hole injection layers 24 of each pixel unit 20 may be arranged at intervals from each other, or may form an integral structure.
  • the hole transport layers 25 of each pixel unit 20 may also be arranged at intervals from each other, or form an integral structure;
  • the electron transport layers 26 of the pixel units 20 may also be arranged at intervals or form an integral structure;
  • the electron injection layers 27 of each pixel unit 20 may also be arranged at intervals or form an integral structure.
  • each second electrode 23 has an integrated structure, and the shape of the through hole 711 is a positive trapezoid.
  • the shape of the through hole 711 is a positive trapezoid.
  • it is difficult to fill the bottom corner area of the positive trapezoid with the material forming the second electrode 23.
  • there is a filling dead space in the through hole 711 (such as the A area and the B area in FIG. 4 ), which in turn causes the second electrode 23 to break or the wire connected to the second electrode 23 to break, which affects the display of the display panel 100 .
  • the filling portion 721 that fills at least a partial area of the through hole 711 is provided, the continuity of the second electrode 23 can be ensured during the preparation process to avoid disconnection and ensure the display panel
  • the normal display of 100 further improves the yield rate of the display panel 100 .
  • the filling part 721 can be any material that can ensure that the light passes through the through hole 711.
  • the material of the filling part 721 can be a transparent resin material, and the transparent resin material can be The entire area of the through hole 711 is filled by spin coating, vapor deposition and the like. Since the transparent resin material has good fluidity, the through hole 711 can be better filled.
  • the upper surface of the filling part 721 is flush with the upper surface of the light-shielding layer 71 , so as to further improve the integrity of the functional layers on the light-shielding layer 71 .
  • the filling part 721 fills the partial area of the through hole 711
  • the light transmitting part 723 is also provided inside the filling part 721
  • the light transmission of the through hole 711 is ensured by the light transmitting part 723, therefore, the filling The material of the portion 721 is not limited, and light-transmitting materials such as transparent resin materials may be used, or non-light-transmitting materials such as black resin materials may be used.
  • the specific shape of the transparent portion 723 is not limited, and the angle formed between the sidewall and the bottom wall of the filling portion 721 may be an acute angle.
  • the cross-sectional shape of the light-transmitting portion 723 in a plane perpendicular to the display panel 100 is trapezoidal, and the length of the top side of the trapezoid is longer than the length of the bottom side of the trapezoid.
  • the length is designed in such a way that the inner sidewall of the filling part 721 adapted to the light-transmitting part 723 is a relatively flat surface, thereby ensuring that the film layer formed on the filling part 721 is well attached to the inner sidewall of the filling part 721, Further improve product quality.
  • the light-transmitting portion 723 is provided in the above-mentioned shape, which is easy to process, thereby reducing production costs and improving production efficiency (details will be described later).
  • the light-transmitting portion 723 can be configured as a light-transmitting hole, that is, the cross-sectional shape of the light-transmitting hole in a plane perpendicular to the display panel 100 is a trapezoid, and the length of the top side of the trapezoid is greater than the length of the bottom side of the trapezoid.
  • the light transmission hole since the light transmission hole is wide at the top and narrow at the bottom, no dead space will be formed in the bottom area of the light transmission hole, so that the functional layers formed on the protective layer 72 can be formed at the bottom of the light transmission hole.
  • the junction area between the side wall and the bottom wall is kept continuous, thereby ensuring the integrity of each functional layer, so as to improve the product quality of the display panel 100 .
  • the material of the filling part 721 can be a light-transmitting material, such as a transparent resin material, and the material of the filling part 721 can also be a black resin material, such as polyimide or polymethyl ether containing a black colorant. Methyl acrylate.
  • the setting of the light-transmitting hole can ensure the light-transmitting property of the through-hole 711 , thereby ensuring that enough light passes through the through-hole 711 and is received by the optical fingerprint sensor 200 , improving the recognition effect of the optical fingerprint sensor 200 .
  • the above-mentioned light-transmitting hole can be formed on the filling part 721 by photolithography process. Due to the material characteristics of the resin material itself, the light-transmitting hole formed by photolithography A cross-sectional shape of the hole in a plane perpendicular to the display panel 100 is a trapezoid, and the length of the top side of the trapezoid is greater than the length of the bottom side of the trapezoid, thereby simplifying the manufacturing process.
  • the light-transmitting portion 723 can also be set as a light-transmitting material that fills the inner space of the filling portion 721, so that the flatness of each functional layer on the protective layer 72 can be ensured, thereby further improving the performance of the display panel 100. product quality.
  • the filling portion 721 may be a light-transmitting material, or may be a non-light-transmitting material.
  • the filling part 721 is a black resin material
  • the light-transmitting part 723 is a film layer formed of a light-transmitting material.
  • the filling part 721 is made of a black resin material, which can well block the light around the light-transmitting part 723, thereby better removing stray light, improving the signal-to-noise ratio of the optical signal entering the optical fingerprint sensor 200, and further improving the optical fingerprint sensor 200.
  • the fingerprint identification effect of the fingerprint sensor 200 is made of a black resin material, which can well block the light around the light-transmitting part 723, thereby better removing stray light, improving the signal-to-noise ratio of the optical signal entering the optical fingerprint sensor 200, and further improving the optical fingerprint sensor 200.
  • the through hole 711 has a shape that is wide at the bottom and narrow at the top, so as to facilitate the processing of the through hole 711.
  • the photolithography process on the optical layer 71 forms the through hole 711, and the filling part 721 is arranged such that: along the direction away from the substrate 101, the orthographic projection area of the filling part 721 on the substrate 101 gradually decreases, so that the through hole 711
  • the bottom edge area is filled, and the angle formed by the bottom wall of the filling portion 721 and the side wall of the transparent portion 723 is an acute angle.
  • the protection layer 72 further includes a protection portion 722 connected to the filling portion 721 , the protection portion 722 covers the light-shielding layer 71 , and the protection portion 722 can form a good protection effect on the light-shielding layer 71 .
  • the filling part 721 and the protecting part 722 can be integrally structured, so as to simplify the structure and processing technology, and improve the production efficiency of the display panel 100 .
  • the protective portion 722 may partially cover the light-shielding layer 71.
  • the orthographic projection of the protective portion 722 on a plane parallel to the display panel 100 is greater than the orthographic projection of the light-shielding layer 71 on a plane parallel to the display panel 100. , it can ensure that the protective part 722 completely covers the light-blocking layer 71, thereby improving the smoothness of the functional layers above the protective layer 72.
  • the protective layer 72 is a whole-layer structure, the preparation process of the protective layer 72 can be simplified and the production cost can be reduced. ,Increase productivity.
  • the protection part 722 can be a light-transmitting material, or a material with a certain light-blocking effect, such as a black resin material, such as polyimide or polymethyl methacrylate containing a black colorant.
  • a black resin material such as polyimide or polymethyl methacrylate containing a black colorant.
  • black resin material as the protection part 722 can improve the light-shielding effect of the protection layer 72, thereby further improving the signal-to-noise ratio of the optical signal entering the optical fingerprint sensor 200, and further improving the fingerprint recognition effect of the optical fingerprint sensor 200.
  • the protection portion 722 is made of black resin material, in order to ensure the light transmission of the through hole 711 , the light transmission portion 723 passes through the protection portion 722 .
  • the light blocking layer 71 and the protective layer 72 in the above embodiment can be arranged at any position in the display panel 100.
  • the pixel definition layer 30 formed by the layer 30 , the light blocking layer 71 and the protection layer 72 is provided with a pixel opening 724 , the pixel opening 724 penetrates the light blocking layer 71 and the protection layer 72 , and the through hole 711 is disposed between the pixel openings 724 .
  • the pixel defining layer 30 which simplifies the structure and processing technology of the display panel 100 and reduces the production cost of the display panel 100 .
  • the light blocking layer 71 and the protective layer 72 are not limited to forming the pixel defining layer 30, and in an optional embodiment, the light blocking layer 71 and the protective layer 72 form the planarization layer 18, for example, as shown in FIG. 9
  • the array substrate 10 includes a substrate 101 and an active layer 11 stacked on the substrate 101, a first insulating layer 12, a first metal layer 13, a second insulating layer 14, a second metal layer 15, a third The insulating layer 16 and the third metal layer 17, the light blocking layer 71 covers the third metal layer 17, the light blocking layer 71 is provided with a through hole 711 for pinhole imaging, the protective part 722 of the protective layer 72 covers the light blocking layer 71, The filling portion 721 of the protective layer 72 fills the via hole 711 .
  • the first metal layer 13 includes the gate of the thin film transistor and the first plate of the capacitor
  • the second metal layer 15 includes the second plate of the capacitor
  • the third metal layer 17 includes the source and drain electrodes of the thin film transistor.
  • a wire 191 is connected to the pixel unit 20 , and the source and drain electrodes are connected to the active layer 11 through a second wire 192 .
  • the light blocking layer 71 and the protection layer 72 jointly form the planarization layer 18 .
  • the pixel defining layer 30 and the pixel unit 20 are disposed on the light blocking layer 71 .
  • This design can also simplify the processing technology of the display panel 100, and when performing fingerprint recognition, the distance between the light blocking layer 71 and the finger is relatively long, so that more light reflected by the finger can enter the optical fingerprint sensor 200, improving the optical fingerprint sensor 200. The recognition effect of the sensor 200.
  • the light blocking layer 71 forms the planarization layer 18, and the protection layer 72 forms the pixel defining layer 30.
  • the light blocking layer 71 covers the first Three metal layers 17 and a through hole 711 for pinhole imaging are arranged on the light blocking layer 71 .
  • the first metal layer 13 includes the gate of the thin film transistor and the first plate of the capacitor
  • the second metal layer 15 includes the second plate of the capacitor
  • the third metal layer 17 includes the source and drain electrodes of the thin film transistor.
  • a wire 191 is connected to the pixel unit 20 , and the source and drain electrodes are connected to the active layer 11 through a second wire 192 .
  • the protection portion 722 of the protection layer 72 covers the light-shielding layer 71 , and pixel openings are formed on the pixel defining layer 30 formed by the protection portion 722 .
  • the filling portion 721 of the protective layer 72 fills the via hole 711 .
  • the light-blocking layer 71 forms the planarization layer 18, and the protective layer 72 forms the pixel-defining layer 30, which can simplify the processing technology of the display panel 100.
  • the thickness is relatively thick, thereby improving The blocking effect of the light blocking layer 71 on the light further improves the signal-to-noise ratio of the light signal entering the optical fingerprint sensor 200 .
  • An embodiment of the present application provides a display device, which includes the above display panel and an optical fingerprint sensor disposed on the back of the display panel, where the optical fingerprint sensor corresponds to the optical fingerprint area.
  • the display device includes the above-mentioned display panel, the display device also has the same advantages as the display panel, for details, reference may be made to the above description.

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Abstract

本申请提供一种显示面板及显示装置，涉及显示技术领域，用于解决显示面板的质量差的技术问题，显示面板包括光学指纹区，光学指纹区设置有挡光层和保护层，挡光层设置有多个通孔；保护层包括填充部，填充部填充通孔内的至少部分区域；填充部填充通孔内的部分区域，填充部围绕通孔的侧壁且紧贴侧壁设置，保护层还包括透光部，填充部位于透光部与通孔的侧壁之间，透光部的高度大于或者等于通孔的深度，填充部的底壁与透光部的侧壁形成的夹角为锐角；或者，填充部填充通孔内的全部区域，填充部的材料为透光材料。这样设置，能够提高显示面板的产品质量。

Description

显示面板及显示装置
本申请要求于2021年08月11日提交中国专利局、申请号为202110919104.2、申请名称为“显示面板及显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，尤其涉及一种显示面板及显示装置。
背景技术
为了获得更大的屏占比，屏下光学指纹识别技术越来越多地被应用于手机、平板电脑等显示装置中。屏下光学指纹识别技术是将光学指纹传感器设置在显示装置的显示面板背面，经显示面板上方的手指反射的光线穿过显示面板并由光学指纹传感器接收，以进行指纹识别。
为了实现指纹识别，通常是利用小孔成像原理将光线引导至光学指纹传感器，然而，这样会影响显示面板的产品质量。
发明内容
鉴于上述问题，本申请实施例提供一种显示面板及显示装置，能够保证显示面板的生产质量。
为了实现上述目的，本申请实施例提供如下技术方案：
本申请实施例的第一方面提供一种显示面板，所述显示面板包括光学指纹区，所述光学指纹区设置有挡光层和保护层，所述挡光层设置有多个通孔；所述保护层包括填充部，所述填充部填充所述通孔内的至少部分区域；所述填充部填充所述通孔内的部分区域,所述填充部围绕所述通孔的侧壁且紧贴所述侧壁设置，所述保护层还包括透光部，所述填充部位于所述透光部与所述通孔的侧壁之间，所述透光部的高度大于或者等于所述通孔的深度，所述填充部的底壁与所透光部的侧壁形成的夹角为锐角；或者，所述填充部填充所述通孔内的全部区域，所述填充部的材料为透光材料。
本申请实施例提供的显示面板具有光学指纹区，光学指纹区中设置有挡光层和保护层，挡光层设置用于小孔成像的通孔，经显示面板上方的手指反射的光线经过通孔，穿过显示面板进入光学指纹传感器，实现指纹识别。保护层能够在不影响通孔的透光性的情况下将通孔填充，保证设置于挡光层之上的各功能层的完整性，提高显示面板的产品质量。
本申请实施例的第二方面提供一种显示装置，其包括如上所述的显示面板以及设置于所述显示面板的背面的光学指纹传感器，所述光学指纹传感器与所述光学指纹区对应。
由于显示装置包括上述第一方面的显示面板，因此，该显示装置也具有与显示面板相同的优点，具体可以参考上文描述。
附图说明
图1为本申请一实施例提供的显示装置的剖视图；
图2为本申请一实施例提供的显示面板的剖视图；
图3为图2所示的显示面板的成像原理图；
图4为本申请另一实施例提供的显示面板的剖视图；
图5为本申请再一实施例提供的显示面板的剖视图；
图6为本申请还一实施例提供的显示面板的剖视图；
图7为本申请另一实施例提供的显示面板的剖视图；
图8为本申请再一实施例提供的显示面板的剖视图；
图9为本申请又一实施例提供的显示面板的剖视图；
图10为本申请还一实施例提供的显示面板的剖视图。
具体实施方式
相关技术中，为了使得手指反射的光线更多地进入光学指纹传感器，在显示面板的阵列基板内增加一层挡光层，并在挡光层的与光学指纹传感器对应的区域设置小孔，利用小孔成像原理将经过显示面板上方的手指反射的光线更多地引导至光学指纹传感器。
然而，上述方案中，小孔的设置会影响挡光层之上的各功能层的完整性，进而影响显示面板的产品质量。
针对上述技术问题，本申请实施例提供了一种显示面板，在挡光层上形成用于小孔成像的通孔，同时利用保护层在不影响通孔的透光性的同时将通孔填充，从而保证设置于挡光层之上的各功能层的完整性，提高显示面板的产品质量。
为了使本申请实施例的上述目的、特征和优点能够更加明显易懂，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其它实施例，均属于本申请保护的范围。
参考图1所示，本申请实施例提供的显示装置包括显示面板100和设置于显示面板100背面的光学指纹传感器200。其中，显示面板100通常用于进行图像等信息显示，以及实现触控功能，显示面板100例如可以为OLED(Organic Light-Emitting Diode)显示面板；光学指纹传感器200用于接收手指反射或折射的光线，实现指纹识别。
如图2所示，显示面板100包括阵列基板10、设置于阵列基板10上的多个像素单元20、用于将像素单元20隔离的像素限定层30以及覆盖像素单元20的封装层50。在需要进行指纹识别时，显示面板100内的像素单元20发出的光照射至放置在显示面板100上的手指后，经手指反射或折射的光线穿过显示面板100，并由光学指纹传感器200接收，以进行指纹识别。
继续参考图2，阵列基板10包括衬底101以及层叠设置于衬底101上的有源层11、第一绝缘层12、第一金属层13、第二绝缘层14、第二金属层15、第三绝缘层16、第三金属层17和平坦化层18，第一金属层13包括薄膜晶体管的栅极和电容的第一极板，第二金属层15包括电容的第二极板，第三金属层17包括薄膜晶体管的源漏电极，源漏电极通过第 一导线191与像素单元20连接，源漏电极通过第二导线192与有源层11连接。
可选地，有源层11可由非晶硅(a□Si)、多晶硅(poly□Si)、有机半导体等制成。第一绝缘层12、第二绝缘层14、第三绝缘层16可以为氧化硅、氮化硅等材料制成的无机材料层。平坦化层18可以为树脂等材料制成的有机材料层。第一金属层13、第二金属层15、第三金属层17可以为钼、钛等金属制成的金属膜层。
阵列基板10的平坦化层18上设置有像素限定层30，像素限定层30设置有多个像素开口，各像素单元20分别位于各像素开口中。
显示面板100具有光学指纹区，光学指纹区设置挡光层71，挡光层71上设置有多个通孔711，多个通孔711用于小孔成像。如图3所示，在进行指纹识别时，手指放置于显示面板100上，经手指反射或折射的光线经过通孔711，然后穿过显示面板100落入光学指纹传感器200，由于光线是沿直线传播的，根据小孔成像原理，手指的图像经通孔711后在光学指纹传感器200上形成倒像。
通孔711的尺寸具体不限，可根据小孔成像的光学原理进行设置，能够实现小孔成像，从而将手指反射的光线更多地引导至光学指纹传感器200即可。例如，在一个可选的实施例中，以平行于显示面板100的平面为截面，通孔711的形状为圆孔，圆孔的孔径为5-20微米，以保证形成于光学指纹传感器200上的虚像的清晰度，提高光学指纹传感器200的识别效果。当然，可以理解的是，通孔711的形状不局限于上述的圆孔，也可以为椭圆孔、方孔等其他形状。
光学指纹区还包括保护层72，保护层72用于在不影响通孔711的透光性的同时将通孔711填充，以保证挡光层71之上的各功能层的完整性。保护层72包括填充通孔711内的至少部分区域的填充部721，在一些实施例中，如图2所示，填充部721的材料为透光材料，填充部721填充通孔711内的全部区域，从而保证挡光层71之上的各功能层的完整性，例如可有效避免阴极断线，以保证显示面板100的产品质量。
在另一些实施例中，填充部721也可以是填充通孔711内的部分区域。例如，在图5所示的实施例中，填充部721围绕通孔711的侧壁且紧贴侧壁设置，保护层72还包括透光部723，填充部721位于透光部723与通孔711的侧壁之间，透光部723的高度大于或者等于通孔711的深度，填充部721的底壁与透光部723的侧壁形成的夹角为锐角。
上述实施例中，利用透光部723保证通孔711的透光性，在透光部723与通孔711的侧壁之间设置填充部721，填充部721的底壁与透光部723的侧壁形成的夹角为锐角，这样，不会在填充部721的底部内侧形成填充死角，保证在形成挡光层71之上的功能层时，该功能层能够在填充部721的内侧壁与底壁交接的区域保持连续，从而能够保证形成于挡光层71上的各功能层的完整性，例如，可有效避免阴极断线现象，进而保证显示面板100的产品质量。
挡光层71的材质可以为任意具有挡光作用的材料，例如可以为黑色树脂材料层等。为了提高挡光层71的挡光效果，挡光层71为黑色矩阵材料层，黑色矩阵材料层的材料可以为含有铬或者碳黑的负性光刻胶。采用黑色矩阵材料层制成的挡光层71，可以提高挡光层71的遮光效果，进而提高进入光学指纹传感器200的光信号的信噪比，保证显示面板100的良率。
在挡光层71为黑色矩阵材料层的实施例中，采用光刻工艺在挡光层71上形成通孔711， 然而，在采用光刻工艺在黑色矩阵材料层上形成通孔711时，由于黑色矩阵材料层的自身特性原因，如图4所示，形成的通孔711的形状为：在垂直于像素限定层30的平面内的截面形状呈正梯形，即上窄下宽的形状。上窄下宽的通孔711会影响形成于挡光层71上的各一体结构的功能层的完整性。
下面以图6所示的显示面板为例，具体说明产生上述问题的原因。如图6所示，各像素单元20均包括第一电极21、发光材料层22和第二电极23。为了方便布线，简化电路，各第二电极23位于像素限定层30上，且各第二电极23为一体结构，即各第二电极23形成整层的第二电极层。其中，第一电极21为阳极，第二电极23为阴极。
进一步参考图6所示，像素单元20还包括空穴注入层24、空穴传输层25、电子传输层26和电子注入层27。空穴注入层24位于作为阳极的第一电极21上，空穴传输层25位于空穴注入层24的背离第一电极21的一侧，空穴注入层24的作用是改善像素单元20中的阳极层与空穴传输层25之间的能级匹配问题。一般情况下，阳极层的制备材料为氧化铟锡层(Indium Tin Oxides，ITO)，常用的空穴传输层25的材料的能级与ITO层的能级并不匹配，导致空穴传输效率较低，通过设置一层空穴注入层24，能够降低阳极层与空穴传输层25之间的注入势垒，协助空穴从ITO层注入空穴传输层25。同样的，电子注入层27能够改善阴极层与电子传输层26之间的能级匹配问题。
各像素单元20的空穴注入层24可以是相互间隔设置，也可以形成为一体结构，类似地，各像素单元20的空穴传输层25也可以是相互间隔设置，或者形成为一体结构；各像素单元20的电子传输层26也可以是相互间隔设置，或者形成为一体结构；各像素单元20的电子注入层27也可以是相互间隔设置，或者形成为一体结构。
上述实施例中，各第二电极23为一体结构，通孔711的形状为正梯形，在第二电极23的制备过程中，形成第二电极23的材料难以填充到正梯形的底角区域，导致通孔711内存在填充死角(如图4中的A区域和B区域)，进而导致第二电极23发生断裂或者第二电极23连接的导线发生断线，影响显示面板100的显示。如图5和图6所示，由于设置有将通孔711的至少部分区域填充的填充部721，从而在第二电极23的制备过程中能够保证其连续性，避免发生断线，保证显示面板100的正常显示，进一步提高显示面板100的良率。
在填充部721将通孔711的全部区域填充的实施例中，填充部721可以为任意能够保证光线穿过通孔711的材料，例如，填充部721材料可以为透明树脂材料，透明树脂材料可通过旋涂、蒸镀等方式将通孔711的全部区域填充。由于透明树脂材料具有很好的流动性，能够更好地填充通孔711。优选地，填充部721的上表面与挡光层71的上表面平齐，从而进一步提高挡光层71之上的各功能层的完整性。而在填充部721填充通孔711的部分区域的实施例中，由于在填充部721的内侧还设置有透光部723，通过透光部723来保证通孔711的透光性，因此，填充部721的材料不受限制，可以采用透光材料，例如透明树脂材料等，也可以采用非透光材料，例如黑色树脂材料等。
在填充部721填充通孔711的部分区域的实施例中，透光部723的具体形状不作限制，能够使其侧壁与填充部721的底壁形成的夹角为锐角即可。在一个可选的实施例中，如图5所示，透光部723在垂直于显示面板100的平面内的截面形状呈梯形，所述梯形的顶边的长度大于所述梯形的底边的长度，这样设计，使得与透光部723适配的填充部721的 内侧壁为较平整的表面，从而保证形成于填充部721上的膜层与填充部721的内侧壁很好的贴附，进一步提高产品质量。另外，将透光部723设置为上述形状，易于加工，从而降低生产成本，提高生产效率(后面有具体介绍)。
透光部723可以设置为透光孔，即透光孔在垂直于显示面板100的平面内的截面形状呈梯形，所述梯形的顶边的长度大于所述梯形的底边的长度。在该实施例中，由于透光孔呈上宽下窄的形状，不会在透光孔的底部区域形成填充死角，从而使得形成于保护层72之上的各功能层能够在透光孔的侧壁和底壁交接的区域保持连续，进而保证各功能层的完整性，以提高显示面板100的产品质量。
上述实施例中，填充部721的材料可以为透光材料，例如为透明树脂材料，填充部721的材料也可以为黑色树脂材料，例如可以为含有黑色着色剂的聚酰亚胺或聚甲基丙烯酸甲酯。透光孔的设置，能够保证通孔711的透光性，进而保证有足够的光线穿过通孔711并被光学指纹传感器200接收，提高光学指纹传感器200的识别效果。
在上述实施例中，填充部721采用透明树脂材料或者黑色树脂材料时，可采用光刻工艺在填充部721上形成上述的透光孔，因树脂材料本身的材料特性，光刻形成的透光孔在垂直于显示面板100的平面内的截面形状呈梯形，所述梯形的顶边的长度大于所述梯形的底边的长度，从而简化了加工工艺。
当然，可以理解的是，透光部723也可以设置为将填充部721的内侧空间填充的透光材料，这样能够保证保护层72之上的各功能层的平整性，从而进一步提高显示面板100的产品质量。在该实施例中，填充部721可以为透光材料，也可以为非透光材料。在一个可选的实施例中，填充部721为黑色树脂材料，透光部723为透光材料形成的膜层。将填充部721设置为黑色树脂材料，能够对透光部723周围的光线形成很好的阻挡，从而更好地去除杂散光，提高进入光学指纹传感器200的光信号的信噪比，进而提高光学指纹传感器200的指纹识别效果。
示例性地，沿远离衬底101的方向，填充部721在衬底101上的正投影面积逐渐递减，通孔711呈下宽上窄的形状，以便于通孔711的加工，例如采用在挡光层71上进行光刻的工艺形成通孔711，而填充部721设置为：沿远离衬底101的方向，填充部721在衬底101上的正投影面积逐渐递减，从而将通孔711的底部边缘区域填充，且使得填充部721的底壁与透光部723的侧壁形成的夹角为锐角。
如图7和图8所示，保护层72还包括与填充部721连接的保护部722，保护部722覆盖挡光层71，保护部722能够对挡光层71形成很好的保护作用。优选地，填充部721与保护部722可以为一体结构，从而简化结构及加工工艺，提高显示面板100的生产效率。
保护部722可以是部分覆盖挡光层71，优选地，保护部722在平行于显示面板100的平面上的正投影大于挡光层71在平行于显示面板100的平面上的正投影，这样设计，能够保证保护部722将挡光层71完全覆盖，从而提高保护层72以上各功能层的平整性，另外，由于保护层72为整层结构，能够简化保护层72的制备工艺，降低生产成本，提高生产效率。
保护部722可以为透光材料，也可以为具有一定挡光作用的材料，例如为黑色树脂材料，黑色树脂材料例如可以为含有黑色着色剂的聚酰亚胺或聚甲基丙烯酸甲酯。采用黑色树脂材料作为保护部722，能够提高保护层72的遮光效果，从而进一步提高进入光学指纹 传感器200的光信号的信噪比，进而提高光学指纹传感器200的指纹识别效果。当保护部722为黑色树脂材料时，为了保证通孔711的透光性，透光部723贯通保护部722。
上述实施例中的挡光层71和保护层72可以设置在显示面板100内的任意位置，在一个实施例中，如图7和图8所示，挡光层71和保护层72形成像素限定层30，挡光层71和保护层72形成的像素限定层30上设置有像素开口724，像素开口724贯穿挡光层71和保护层72，通孔711设置在像素开口724之间。这样设计，无需另外设置像素限定层30，简化了显示面板100的结构和加工工艺，降低了显示面板100的生产成本。
可以理解的是，挡光层71和保护层72不局限于是形成像素限定层30，在一可选的实施例中，挡光层71和保护层72形成平坦化层18，例如，如图9所示，阵列基板10包括衬底101以及层叠设置于衬底101上的有源层11、第一绝缘层12、第一金属层13、第二绝缘层14、第二金属层15、第三绝缘层16和第三金属层17，挡光层71覆盖第三金属层17，挡光层71上设置有用于小孔成像的通孔711，保护层72的保护部722覆盖挡光层71，保护层72的填充部721填充通孔711。
第一金属层13包括薄膜晶体管的栅极和电容的第一极板，第二金属层15包括电容的第二极板，第三金属层17包括薄膜晶体管的源漏电极，源漏电极通过第一导线191与像素单元20连接，源漏电极通过第二导线192与有源层11连接。
上述实施例中，挡光层71和保护层72共同形成平坦化层18。像素限定层30和像素单元20设置于挡光层71上。这样设计，也能够简化显示面板100的加工工艺，且在进行指纹识别时，挡光层71距离手指的距离较远，使得经手指反射的光线能够更多地进入光学指纹传感器200，提高光学指纹传感器200的识别效果。
在另一可选的实施例中，挡光层71形成平坦化层18，保护层72形成像素限定层30，例如，如图10所示，阵列基板10包括衬底101以及层叠设置于衬底101上的有源层11、第一绝缘层12、第一金属层13、第二绝缘层14、第二金属层15、第三绝缘层16和第三金属层17，挡光层71覆盖第三金属层17，挡光层71上设置有用于小孔成像的通孔711。
第一金属层13包括薄膜晶体管的栅极和电容的第一极板，第二金属层15包括电容的第二极板，第三金属层17包括薄膜晶体管的源漏电极，源漏电极通过第一导线191与像素单元20连接，源漏电极通过第二导线192与有源层11连接。
保护层72的保护部722覆盖挡光层71，保护部722形成的像素限定层30上设置像素开口。保护层72的填充部721将通孔711填充。这样设计，挡光层71形成平坦化层18，保护层72形成像素限定层30，能够简化显示面板100的加工工艺，同时，由于挡光层71作为平坦化层18，厚度较厚，从而提高挡光层71对光线的阻挡效果，进一步提高进入光学指纹传感器200的光信号的信噪比。
本申请实施例的提供一种显示装置，其包括如上的显示面板以及设置于显示面板的背面的光学指纹传感器，光学指纹传感器与光学指纹区对应。
由于显示装置包括上述的显示面板，因此，该显示装置也具有与显示面板相同的优点，具体可以参考上文描述。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行 等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (12)

  1. 一种显示面板，其中，
    所述显示面板包括光学指纹区，所述光学指纹区设置有挡光层和保护层，所述挡光层设置有多个通孔；
    所述保护层包括填充部，所述填充部填充所述通孔内的至少部分区域；
    所述填充部填充所述通孔内的部分区域，所述填充部围绕所述通孔的侧壁且紧贴所述侧壁设置，所述保护层还包括透光部，所述填充部位于所述透光部与所述通孔的侧壁之间，所述透光部的高度大于或者等于所述通孔的深度，所述填充部的底壁与所述透光部的侧壁形成的夹角为锐角；
    或者，所述填充部填充所述通孔内的全部区域，所述填充部的材料为透光材料。
  2. 根据权利要求1所述的显示面板，其中，所述挡光层包括黑色矩阵材料层，所述通孔在垂直于所述显示面板的平面内的截面形状呈正梯形。
  3. 根据权利要求2所述的显示面板，其中，所述黑色矩阵材料层包括含有铬或碳黑的负性光刻胶。
  4. 根据权利要求1所述的显示面板，其中，所述填充部填充所述通孔内的部分区域，所述透光部在垂直于所述显示面板的平面内的截面形状呈梯形，所述梯形的顶边的长度大于所述梯形的底边的长度
  5. 根据权利要求4所述的显示面板，其中，所述透光部为透光孔，所述填充部包括黑色树脂材料或透光材料；
    或者，所述透光部为透光材料形成的膜层，所述填充部为黑色树脂材料。
  6. 根据权利要求5所述的显示面板，其中，所述显示面板包括阵列基板，所述阵列基板包括衬底，沿远离所述衬底的方向，所述填充部在所述衬底上的正投影面积逐渐递减。
  7. 根据权利要求5所述的显示面板，其中，所述黑色树脂材料包括含有黑色着色剂的聚酰亚胺或聚甲基丙烯酸甲酯。
  8. 根据权利要求1所述的显示面板，其中，所述保护层还包括与所述填充部连接的保护部，所述保护部覆盖所述挡光层。
  9. 根据权利要求8所述的显示面板，其中，所述保护部在所述显示面板的衬底上的正投影大于所述挡光层在所述衬底上的正投影。
  10. 根据权利要求1所述的显示面板，其中，所述显示面板包括衬底，位于所述衬底一侧的平坦化层，以及设置于所述平坦化层远离所述衬底一侧的像素限定层；所述挡光层和所述保护层形成所述像素限定层。
  11. 根据权利要求1所述的显示面板，其中，所述显示面板包括衬底，位于所述 衬底一侧的平坦化层，以及设置于所述平坦化层远离所述衬底一侧的像素限定层；所述挡光层形成所述平坦化层，所述保护层形成所述像素限定层。
  12. 一种显示装置，其中，包括如权利要求1至11任一项所述的显示面板以及设置于所述显示面板的背面的光学指纹传感器，所述光学指纹传感器与所述光学指纹区对应。
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